package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    OrderFeignService orderFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    /**
     * 1.库存自动解锁
     *  下订单成功 库存锁定成功 接下来的业务调用失败 导致订单回滚 之前所定的库存就要自动解锁
     * 2.订单失败
     *  锁库存失败
     *
     *  只要解锁库存的消息失败 一定要告诉服务器解锁失败了 这个消息先不要删除 然后尝试重新解锁
     *
     */


    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId){
        //库存解锁
        wareSkuDao.unlockStock(skuId,wareId,num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);//变为已解锁
        orderTaskDetailService.updateById(entity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * skuId: 1
         * wareId: 2
         */
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if(!StringUtils.isEmpty(skuId)){
            queryWrapper.eq("sku_id",skuId);
        }

        String wareId = (String) params.get("wareId");
        if(!StringUtils.isEmpty(wareId)){
            queryWrapper.eq("ware_id",wareId);
        }


        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(entities == null || entities.size() == 0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？高级
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");

                if(info.getCode() == 0){
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            }catch (Exception e){

            }
            wareSkuDao.insert(skuEntity);
        }else{
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            //SELECT SUM(stock-stock_locked) FROM wms_ware_sku WHERE sku_id=1
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count==null?false:count>0);
            return vo;
        }).collect(Collectors.toList());

        return collect;
    }

    /**
     * 为某个订单锁定库存
     * (rollbackFor = NoStockException.class)
     * 默认只要是运行时异常都会回滚
     * @param vo
     *
     * 库存解锁的场景
     * 1).下订单成功 订单过期没有支付被系统自动取消 被用户手动取消 都要解锁库存
     * 2).下订单成功 库存锁定成功 接下来的业务调用失败 导致订单回滚
     *      之前所定的库存就要自动解锁
     * @return
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        // TODO: 2020/11/17 正常逻辑应该按照下单的收货地址 找到一个就近的仓库 锁定库存
        //1.这里找到每个商品在哪个仓库有库存进行简单处理
        List<OrderItemVo> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock wareHasStock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            wareHasStock.setSkuId(skuId);
            wareHasStock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            wareHasStock.setWareId(wareIds);
            return wareHasStock;
        }).collect(Collectors.toList());

        //2.锁定库存
        for (SkuWareHasStock hashStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hashStock.getSkuId();
            List<Long> wareIds = hashStock.getWareId();
            if (wareIds == null || wareIds.size() == 0){
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1.如果每一个商品都锁定成功 将当前商品锁定了几件的工作单记录发给MQ
            //2.锁定失败 前面保存的工作单消息就回滚了 发送出去的消息 即使要解锁记录 由于数据库查不到id 所以就不用解锁了
            //
            for (Long wareId : wareIds) {
                //成功就返回1 否则就返回0
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hashStock.getNum());
                if (count == 1){
                    skuStocked = true;
                    // TODO: 2020/11/19 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "", hashStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(entity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity,stockDetailTo);
                    //只发Id不行 防止回滚以后找不到数据
                    lockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }else {
                    //当前仓库锁失败 重试下一个仓库
                }
            }
            if (skuStocked == false){
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {

            StockDetailTo detail = to.getDetail();
            Long detailId = detail.getId();
            //解锁
            //1.查询数据库关于这个订单的锁定库存信息。
            //有：证明库存锁定成功了
            //      这个时候要不要解锁还要判断订单的情况
            //      1.没有这个订单 必须解锁库存
            //      2.有这个订单 也不能直接解锁库存
            //          订单状态：已取消的需要解锁库存  没取消的不能解锁库存
            //没有：库存锁定失败 库存回滚了 这种情况无需解锁
            WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
            if (byId!=null){
                //解锁
                Long id = to.getId();
                WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
                String orderSn = taskEntity.getOrderSn();//根据订单号查询订单的状态
                R r = orderFeignService.getOrderStatus(orderSn);
                if (r.getCode() == 0){
                    //订单数据返回成功
                    OrderVo data = r.getData(new TypeReference<OrderVo>() {});
                    if (data == null || data.getStatus() == 4){
                        //订单不存在
                        //订单已经被取消了 才能解锁库存
                        if (byId.getLockStatus() == 1){
                            //当前工作单详情 状态是1：已锁定而且未解锁才可以解锁
                            unLockStock(detail.getSkuId(),detail.getWareId(),detail.getSkuNum(),detailId);
                        }
                    }
                }else {
                    //消息拒绝以后重新放到队列里面 让别人继续消费解锁
                    throw new RuntimeException("远程服务失败");
                }
            }else{
                //无需解锁
            }
        }
    //防止因为订单服务卡顿 导致订单状态消息一直改不了 库存消息优先到期 这样库存在解锁的时候查到的订单状态为新建状态
    //正常情况况下是订单的状态为已取消才会解锁库存 这样就会导致库存不会去解锁
    //最终因为卡顿的订单造成永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新库存的状态 防止重复解锁库存
        WareOrderTaskEntity entity = orderTaskService.getOrderTaskByOrderSn(orderSn);
        //按照工作单找到所有没有解锁的库存 进行解锁
        Long id = entity.getId();
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity detailEntity : entities) {
            unLockStock(detailEntity.getSkuId(),detailEntity.getWareId(),detailEntity.getSkuNum(),detailEntity.getId());
        }
    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }
}
